Issue Summary

JQL "not in" not working as expected in some fields

Steps to Reproduce

1. Create a JQL filter such as:

   project = "PROJECT NAME" AND labels not in (test)
   

Expected Results

All tickets that do not have a label "test" should be returned.

Actual Results

No tickets are returned.

Notes

I was able to reproduce using the following fields:

• Assignee
• Labels
• Request participants

On the other hand, if we use the "in" condition it works as expected.

project = "PROJECT NAME" AND labels in (test)

Workaround

None available so far.